PCSX is the only one i know of that is open source. There arnt really two ports. There was the 1.3 port done by some unknown (i think?) to the DC community who got hit by a car or something right after releasing it. Then the 1.4 was an report implementing the changes made in PCSX 1.4 into the DC version, not really a whole new port. 1.5 and the subsequent WIP versions were all relatively unofficial.
All it needs is work. Most people feel that time is better spent getting the things that definetly can get fullspeed to fullspeed. Or more like the things that are really close, getting them there.
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